PETROLOGENESIS OF SIKHORAN ULTRAMAFIC- MAFIC COMPLEX, SOUTHEAST IRAN

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GHASEMI H.; SABZEHIE M.; EMAMI H.; JUTEAU T.; BLLON H.; RASTAD E.

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Journal: GEOSCIENCES Year:2001 | Volume:10 | Issue:39-40 Page(s): 46-69

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Title

PETROLOGENESIS OF SIKHORAN ULTRAMAFIC- MAFIC COMPLEX, SOUTHEAST IRAN

Author(s)

Keywords

OPHIOLITEQ2

IRANQ2

SIKHORANQ3

ULTRAMAFICQ4

MAFICQ4

Abstract

The SIKHORAN ULTRAMAFIC- MAFIC Complex is located in the Sanandaj-Sirjan metamorphic belt, Southeast IRAN. This complex is surrounded by palaeozoic metamorphics, overlain by mesozoic glaucophane schists with Ashin reverse fault and consists of three main units including porphyroclastic harzburgites (mantle unit?), transitonal and layered ULTRAMAFIC-mafic unit. The Abshour isotropic gabbros with a late- middle Triassic age occurr as a huge intrusion cutting this complex. It has produced an intense contact metamorphism-in the palaeozoic metamorphics. Scattered diabasic dykes with late-middle Jurassic ages cut all of them. This polygenetic complex does not include certain essential units of a classic OPHIOLITE sequence such as dyke swarms and pillow lavas, hence we can not name it an OPHIOLITE sensce stricto. Porphyroclastic harzburgites and porphyroclastic dunites of the transitional zone have deformational fabrics and mineral and whole rock compositions of alpine mantle peridotites. The upper part of transitional zone composed of a rhythmic sequence of layered dunite-wehrlite-pyroxenite with mamgmatic origin. Layered ULTRAMAFIC-mafic cumulates consist of an ULTRAMAFIC (feldspathic peridotites) section in the lower and a thick MAFIC (gabbroic) section in the upper part. Detailed studies of the main lithologic units of this complex indicate, that the lower part (ultramafics) crystallized in an open system replenisihed by new magmatic injections and the upper (gabbroic) part in a closed system. This trend is similar to that of low-Ti OPHIOLITEs magmatic secuerce.Field relations of different lithologic units, regional geology. and absolute age determinations show that this compex has been formed in an extensional tectonic environment by partial melting (29-30%) of an upper mantle diapir during the upper Carboniferous-Permian (simultaneously with Hercynian orogeny and Initation of riftng of Zagros and Sanandaj-Sirjan Neotethys basins) and subsequently by isotropic gabbros and diabasic dykes in the late- middle Triassic (Early Cimerian) and Jurassic (Late Cimerian) times respectively.

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APA: Copy

GHASEMI, H., SABZEHIE, M., EMAMI, H., JUTEAU, T., BLLON, H., & RASTAD, E.. (2001). PETROLOGENESIS OF SIKHORAN ULTRAMAFIC- MAFIC COMPLEX, SOUTHEAST IRAN. GEOSCIENCES, 10(39-40), 46-69. SID. https://sid.ir/paper/31868/en

Vancouver: Copy

GHASEMI H., SABZEHIE M., EMAMI H., JUTEAU T., BLLON H., RASTAD E.. PETROLOGENESIS OF SIKHORAN ULTRAMAFIC- MAFIC COMPLEX, SOUTHEAST IRAN. GEOSCIENCES[Internet]. 2001;10(39-40):46-69. Available from: https://sid.ir/paper/31868/en

IEEE: Copy

H. GHASEMI, M. SABZEHIE, H. EMAMI, T. JUTEAU, H. BLLON, and E. RASTAD, “PETROLOGENESIS OF SIKHORAN ULTRAMAFIC- MAFIC COMPLEX, SOUTHEAST IRAN,” GEOSCIENCES, vol. 10, no. 39-40, pp. 46–69, 2001, [Online]. Available: https://sid.ir/paper/31868/en

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